Calculating machine



March 17, 1936. G. c. CHASE CALCULATING MACHINE Filed Jan. 17, 1934 4 Sheets-Sheet l I INVENTOR Geo g'e a Civase d ph ATTORNEY March 17, G. C gr- CALCULATING MACHINE Filed Jan. [17, 1954 4 Sheets-Sheet 2 INVENTOR Geo/9e C hase L7 @TTQRNEY March 17, 1936. Q CHASE 2,034,085

CALCULATING MACHINE Filed Jan. 17, 1934 4 Sheets-Sheet 3 March 17, 1936.

G. c. CHASE CALCULATING MACHINE Filed Jan. 17, 1934 4 Sheets-Sheet 4 INVENTOR 92 C. CFzase Patented Mar. 17, 1936 UNITED STATES PATENT OFFICE CALCULATING MACHINE George C. Chase, South Orange, N. J assignor to Monroe Calculating Machine Company, Orange, N. J a corporation of Delaware Application January 17, 1934, Serial No. 706,950

5 Claims. (01. 235-19) The invention has relation to calculating machines, and more particularly to means for effecting a single registration in the accumulating register of such a machine without changing the 5 reading of the multiplier-quotient register thereof. v Calculating machines are commonly provided with multiplier-quotient registering mechanism which is in effect a revolution counter, and which effects either an additive or a subtractive registration during each cycle of operation of a machine. Therefore, in operating a motor driven calculating machine, it has been customary, in transfering a dividend from the keyboard of the machine to the main register (or other value which it is desired to register without disturbing the multiplier-quotient register) to effect an ordinary additive operation; clear the keyboard, and thereafter to remove the unwanted registration from the multiplier-quotient register. This last operation is sometimes effected by a subtractive operation of the machine which, since the keyboard has been cleared, will make no change in the main register, but will reversely operate the multiplier-quotient register, to remove the previous registration therefrom. This has entailed three manual operations, and according to the present invention it is proposed to efiectsuch operations by mechanism responsive to the depression of a single operating key.

The invention consists in the novel construction and combination of parts, as set forth in the appended claims. v

In the accompanying drawings, illustrating the invention: 1

Fig. -1 is a right side elevation of a calculating machine embodying the invention, with the casing removed.

Fig. 2 is a left side elevation of the same, with the casing removed.

Fig. 3 is a detail elevation of the dividend key and associated parts, these parts being shown in normal position.

Fig. 4 is a similar view, with the parts shown in the position taken at the end of the additive cycle of operation, the dividend key being held depressed.

Fig. 5 is a detail elevation of the change lever for a modified form of quotient register, with associated parts.

Fig. 6 is a similar view of the change gearing for the quotient register.

Fig. '7 is a detail elevation, taken at right angles to the plane of Figure 6. The invention is shown as applied to a Monroe calculating machine, including motor drive mechanism constructed in accordance with the disclosure of U. S. Patent 1,566,650, issued to George C. Chase on December 22, 1925.

In this machine, the depression of a plus bar 5 I20, or of a minus bar I2I (Fig. 1) will rock a clutch lever III (Fig. 2) into engagement with one or another of the elements of the differential gear reversing transmission mechanism I85, this engagement serving through a suitable gear 10 train to effect forward or reverse movement of a counting finger 1| (Fig. 1), mounted on a shaft 13, and also of the usual differential actuator mechanism, (indicated at 5 in Fig. 2) which is settable from the keyboard I8 of the machine. 15 From the actuators 5 the forward or reverse movement is transmitted to the numeral wheels I3 of the main register.

The special motor key forming the subject of the present invention will for convenience be 20 termed a dividend key, although it is obvious that this key may be useful in' entering other values into the wheels I3 ofthe machine.

The dividend key, numbered 81 on the drawings, is shown as mounted immediately inside the 5 right hand frame plate of the machine and is provided with a pawl 88 adapted in the depression of the key to rock a bell crank lever 88 from the position shown in Fig. 3 into the position shown in Fig. 4, this bell crank lever being held 30 in either of its two adjusted positions by a spring click 88. When the key 81 is fully depressed,

a tail 8| of the pawl 88 will contact with a stud 82, moving the pawl out of engagement with the bell crank lever 88. 5 Bell crank lever 88 has an aperture loosely engaged by a pin mounted in one arm of. a lever 83, fulcrumed upon the stud 82, the other arm of said lever being provided with a pivoted crosshead 84, held in relation to the lever by a spring and 40 a stop 88. In the movement of lever 83 from the position of Fig. 3 to that shown in Fig. 4, crossv head 84 will drop away from engagement with a pin 81, bringing a lug 88 of said cross-head into position above an arm 88 of rock shaft I25. Rock 45 shaft I25 is the-connecting member between the plus and minus bars I28, HI and the setting lever' I28 (shown in Fig. 2) which is provided with opposed shoulders adapted to contact with a pin 50 I28 in the reversing clutch lever I I I. Therefore, upon depression of key 81, cross-head 84, contacting with arm 88, will rock the shaft I25 in a counter-clockwise direction as seen in Figs. 2, 3,

and 4, and will throw the clutch lever III into 55 additive clutch engagement with the gearing I85, starting an additive registration.

One of the gears 16 of the driving train (Fig. 1) is provided with a shaft ll upon which is mounted, inside the right hand frame plate, a cam I (Figs. 3 and 4). The above-described movement of lever 93, has brought an upper lug IIII of crosshead 94 against the shoulder of cam I80, as shown in Fig. 4, and, shaft 'I'I rotating in a clockwise direction during the additive movement of the parts, cam I00 will move cross-head 9 13 out of contact with the arm 99 of shaft I25, whereupon said shaft, under the influence of a suitable spring on setting plate I28 will return to its normal position, illustrated in 'fulllines in Figs. 3 and 4. At the end of the cycleof additive movement lug I III will fall from the high point of cam I00 into the position shown in Fig. 4, the lug 98 now lying below arm 99.

As setting lever I28 was rocked back to normal position a lever I 34 (Fig. 2) was allowed to move under the influence of its spring, carrying a pawl I36 into engagement with a trigger 3I and disengaging said trigger from a pawl 25, whereupon said pawl was allowed to drop into engage;

- ment with a rock lever 22 connected by a rod 2! and crank 20 with the shaft I3. Pawl 25, falling behind a shoulder of rock arm 22 serves to connect stop lever 2d with said rock lever so that the two parts will move forwardly in unison, tensioning a spring 28 and also, through engagement of a cam arm I44 of lever 24 with a pin in reversing clutch lever-I I I, serving to restore said clutch lever to neutral or unclutching position. Thus, the differential actuators and other driven parts are allowed to overrun their full cycle position, and are then returned to and through such position by the spring 28. As the parts pass reversely through full cycle position the cam I88, turning counter-clockwise as seen in Fig. 4, will engage the lug IM and lift cross-head 96 and lever 93 I from the position shown in Fig. 4 to that shown ,in Fig. 3, the lug 98 of cross-head 9lmoving the arm 89 of .shaft I25 into the dotted line or subtract position shown in Fig. 4. This serves to throw the clutch yoke I II into subtractive clutch position, and a subtractive cycle of operation results.

During the first or additive cycle of operation, however, a lug I82 of bell crank lever 89 has thrown a non-repeat lever I6 into active position wherein a cam portion of said lever is engaged by a rotary tooth I1. Therefore, after the amount on keyboard I8 has been registered, tooth II will move lever I6 into engagement with a clearing lever I5, adapted to release the depressed keys of the keyboard I8 in well-known manner, as shown for instance in U. S. Patent 1,432,616, issued to E. E. Phinney on October 17, 1922. The non-repeat lever I 6 is also under the control of a key 34, which, when latched in depressed position allows lever I6 to stand inactive, but when unlatched and allowed to rise, operates a rocker 35 into contact with the lever I6, moving the latter into the path of movement of the tooth I'I.

, It will be obvious from the above-description, that upon the depression of dividend key 81 the machine will effect a single cycle of additive operation, registering the amount set on keyboard I8 in the wheels I3, registering'l in a. wheel 85, and clearing the keyboard I8. Thereupon the .machine will be reversed and will effect a single cycle of subtractive operation, during which there will be no registration on the wheels I3,

tracted from the wheel 85,- leaving said wheel at 0.

'As soon as cross-head 94 was lifted by cam I80 into the position illustrated in Fig. 3," lug 98- was moved out of engagement with arm 99 of shaft I25, by contact of the cross-head with pin 91, so that shaft I25 was allowed to return into neutral position, lever I34.thereupon moving to bring pawl I 36 again in contact with trigger 3|, to trip the pawl 25 and allow it to fall into engagement with arm 22. Therefore, the clutch will be disengaged and, after the inertia of the parts has been absorbed, they will settle into full cycle position.

It will be observed that the desired program will be effected irrespective of the length of time during which the key 81 is held depressed by the operator, since the pawl 88 will not prevent the return movement of hell crank lever 89, and if the key 81 is released after the return of said bell crank'lever, the pawl will ratchet over the engaging portion of the lever and return to the position shown in Fig; 3.

The multiplier-quotient register, shown in Fig. 1, is operated from a nineteen-tooth gear wheel,

the periphery of the wheels 85 being customarily of figures, reading from 0 to 9. This type of multiplier-quotient register is frequently supplied with tens carry mechanism between the register wheels, as shown, for instance, in U. S. Patent 1,504,741, issued to George 0. Chase on August 12, 1924. This type of multiplier-quotient register is provided with change gearing, controlled by a hand lever, which lever may be set into multiplication or into division position, according'to the operation to be performed. In machines equipped with counting mechanisms of this character, it may be desired that the dividend key should set the change lever into division position, so that a following division operation may be performed without manual setting of this change lever.

For this purpose the lever 93 may be connected, through the stud 92, with an arm I83 (Fig. provided with a pawl I86 normally engaging the end of a second pawl I85 pivoted upon change lever 389. Upon depression of dividend key 81, arm I83 will be rocked downwardly, bringing pawl I86 into position beneath pawl I85. 'Upon movement of lever 83 back to its normal position by the operation of cam I88, pawl I84 will act to lift pawl I85 to bring a tooth I86 of the latter pawl into engagement with a pin I81 fixed in a gear I5 of the driving train. When pawl I85 is thus lifted, however, the parts have been moved beyond full cycle position in a subtractive direction, so that pin I81 will not contact with tooth I86 until the end of the subtractive cycle of operation, at which time it will act to throw lever 399 from multiplying position illustrated in Fig. 5, rearwardly into division position. This will operate to rock a yoke 392 engaging a clutch 3! of the change gearing, shiftingsaid clutch out of engagement with one set of gears and into engagement with the opposite set. These gears 393 (Figs. 6 and 7) areof conventional design, and serve to rotate the counting finger shaft 389 forwardly or reversely, to move the counting finger "I through the gear teeth of the related counting wheel 388 in forward or in reverse direction.

I claim: 1. In a calculating machine having a register adapted for positive and negative sign accumulation and a coacting quotient register comprising reversely rotatable numeral wheels; the combination with keys settable to determine amounts to be registered upon the first-named register, means for releasing the set amount keys, motor driven cyclic means for effecting registrations upon both of said registers and for operating the key releasing means, and clutch and sign determining means settable to effect operation of said motor driven cyclic means and including gears adjustable to reverse the direction of rotation of a quotient wheel, of a manually operable key, a device settable by said key to set the clutch and sign determining means to effect a cycle of registering operation of the cyclic means and thereby cause operation of the key releasing means, and a member operable by the cyclic means to readjust the set device and thereby, adjust the reverse gears and effect a second cycle of quotient register operation.

2. In a calculating machine having a register adapted for positive and negative sign accumulation, and a coactive reversible quotient register;

the combination with keys settable to determine.

amounts to be registered upon the first-named register, means for releasing the set amount keys, motor driven cyclic means for effecting registrations upon both of said registers and for operating the key releasing means, and clutch and sign determining means settable to effect operation or said motor driven cyclic means, of a manually operable key, a control device settable by said key to set the clutch and sign determining means to effect a cycle .ofpositive registering operation of the cyclic means and thereby cause operation of the key 'releasing means, and a member operable by the cyclic means to readjust the set control device to reverse thesign determining means and effect a cycle of negative driven movement.

3. In a calculating machine having a reversible register, a reversible quotient register, and coactive reversible actuators for said registers including difierentially adjustable elements related to the first-named register; the combination with keys settable to differentially adjust said actuator elements, means including a member driven in time with the actuators to release the setamount keys, motor drive means for said actuators, and clutch and sign, determining means settable to eifect movement of said actuators, control means including a rotary tooth associated with said motor drive means, a manually operable key, and a device settable by said key to set the clutch and sign determining means to effect a cycle of forward movement of the actuators and an operation of the key releasing means, said device being adjustable by the rotary tooth to reset the clutch and sign determining means to reverse the movement of the actuators and effect a cycle of movement thereof.

4. In a calculating machine having a register adapted for positive and negative sign accumu- .lation and a coactive reversible quotient register;

the combination with keys settable to determine amounts to be registered upon the first-named register, means for releasing the set amount keys, settable repeat, non-repeat means controlling the releasing means, motor driven cyclic means for effecting registrations uponboth of said registers and for operating the key releasing means, and clutch and sign determining means settable to effect operation of said motor driven cyclic means, of a manually operable key, a control device settable by said key to set the clutch and sign determining means to effect a cycle of positive registration and thereby cause operation of the key releasing means, irrespective of the setting oi the repeat, non-repeat means, and a member Operable by the cyclic means to readjust the set control device and thereby reverse the sign determining means and effect a cycle of negative driven movement.

5. In a calculating machine having a dividend register adapted for positive and negative signaccumulation, and a coactive quotient register reversible upon change of sign in the accumulative movement of the dividend register; the combination with secondary reversing means for the quotient register adapted to control registration like or unlike the sign of the accumulative movement of the dividend register, keys settable to determine amounts to be registered upon the dividend register, means for releasing the set amount keys, motor driven cyclic means for effecting registrations upon both oi' said registers and for operating the key releasing means, and clutch and sign determining means settable to effect operation of said motor driven cyclic means, of a manually operable key, a control device settable by said key to set the clutch and sign determining means to effect a cycle oi rfosltive registration and thereby cause operation of the key releasing means, and a member operable by the cyclic means to readjust the set control device and thereby reverse the sign determining means and effect a cycle of negative driven 

